Spader-maker Imants has been doing healthy business in a number of countries since it invented the technique in the 1960s. It makes some 350 machines a year and sells them primarily to Belgian, Dutch, German and US farmers. And though the spader travels at a relatively steady 6kph, its ability to completely mix the soil down to a depth of 250-300mm means that, with a seed drill fitted, it can have the whole job done in a single pass.
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